What is CVE-2011-2670?

CVE-2011-2670 is a medium-severity vulnerability in Mozilla Firefox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-13.

How severe is CVE-2011-2670?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Mozilla Firefox

CVE-2011-2670

Mozilla Firefox before 3.6 is vulnerable to XSS via the rendering of Cascading Style Sheets

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-01-13 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Mozilla Firefox — versions before 3.6

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jvn.jp/en/jp/JVN74649877/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2011-2670?: CVE-2011-2670 is a medium-severity vulnerability in Mozilla Firefox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-13.
How severe is CVE-2011-2670?: Medium severity. CVSS v3 base score is 6.1 out of 10.